Lamp shade or globe.



No. 663,796. Farmen: dec. n, lsoo. w. L. sTnAcHAN.

LAMP SHADE 0B GLOBE.

(Application filed June 30, 1900.)

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w. L. sTnAcHAN. LAMP SHADE DR GLOBE.

(Application led June 3D, 1900.)

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WILLIAM LUMSDEN STRACHAN, OF LONDON, ENGLAND.

LAMP sHADEoR GLOBE.

SPECIFICATION forming' part of Letters Patent No. 663,796, dated December 11, 1900.

Application led .Tune S0, 1900. Serial No. 22,165. lNo model.)

To ctZ whom t may con/cern:

Be it known that I, WILLIAM LUMSDEN STRAOHAN, a subject of the Queen of Great Britain, residing at 88 St. James street, London, England, have invented new and useful Improvements in Lamp Shades or Globes, of which the following is a specification.

The object of this invention is to provide a light refracting and diffusing shade which may be easily handled and easily kept clean and is generally suitable for application to gaselamps and to electric lamps used forlighting streets and large spaces, with the object of causing the horizontal and upwardlyprojected rays of light to be refracted in the down ward direction and at the same time diffused, so as to render the light soft and pleasant to the eyes.

The invention consists, essentially, in a shade comprising a light refracting and diffusing medium,composed of a spirally-wound rod of glass of hemispherical or bowl shape, hermeticallyinclosed between inner and outer walls of translucent glass, whereby the light refracting and diffusing medium will be protected from injury in handling the shade and will be shielded from the accumulation of dust, by which the light-refracting qualities of the medium would otherwise very soon be so impaired as to render it practically useless.

The accompanying drawings, forming part of this specification, illustrate the invention by way of example only.

Figure l is a sectional elevation of a shade to be used for the roof-lamps of a railway-carriage. Fig. 2 is a sectional elevation of a shade for an electricarc lamp, and Fig. 3 is a sectional elevation of a shade to be applied to an ordinary gas-lamp orto an incandescent gas-lamp.

In Fig. l the shade is adapted to be supported from above, and consists of the glass rod @,of circular section,spirally wound in the form of an approximately hemispherical bowl, and of inner and outer walls b c, of clear glass and of corresponding bowl-shaped form, respectively adapted to lit closely around and within the bowl-shaped spiral a, so as to securely retain it in position and protect it from inj ury and dirt... The space between the inner and outer walls wherein the spiral is contained is hermetically sealed by cement or plaster, as at d, run in between the edges of the inner and outer bowls, which edges may be flanged, as at e, or be otherwise adapted to form a seat for the cement and afford a means whereby the shade may be supported from above in a ring or holder forming part of the casing of the lamp, as will be readily understood. Such a shade is especially applicable for railway-carriage roof-lamps. In the case of arc-lights the shade would be supplemented by the usual reiector above.

The shade may be provided with a central aperture below, surrounded by a flange or neck adapted to be supported in a gallery or holder, as in the case of an ordinary street or other gas-lamp in which the gas-pipe rises directly from below, the inner and outer walls having concentric flanges or necks, as at f, Fig. 3, the intervening space being sealed with cement, as at d'.

The form of the shade may be varied according to requirements-as, for instance,

from that of a shallow bowl less than a hemi- `due to the employment of ground glass or other semi'opaque material.

' I claim- '1, A lamp-shade formed by the combination with a bowl-shaped light-refracting medium formed of a spirally-wound glass rod, of inner and outer concentric and spaced glass bowls secured together and fitting closely within and about the spiral rod, the intervening space between the bowls being sealed so that the spiral rod is inclosed and protected, substantially as described.

2. A lamp shade or globe, comprising inner and outer concentric and spaced walls secured together to form a hermetically-sealed space between them, and a light refracting and diffusing inedium formed of a series of contacting coils of glass arranged in the space between the said walls and in contact therewith, substantially as described.

IOO

3. A lamp shade or globe, Consisting of two Contact therewith, the Several coils being in bowl-shaped glass bodies of different sizes Contact with one another, substantially as deand tting one within the other Lo form a space scribed.

between them, the upper edges of the bowls WILLIAM LUMSDEN STRACHAN. 5' being flanged and resting one upon the other, Witnesses:

and a series of connected coils of glass ar- T. W. KENNARD,

ranged in the space between the bowls and in C. G. CLARK. 

